Question Type Distribution (NEET 2016–2024)
| Question Type | Frequency | Typical Marks | Difficulty |
|---|---|---|---|
| Mole-to-mass / mass-to-mole conversion | Very High (every year) | 4 | Easy–Medium |
| Number of molecules / atoms from mass | High | 4 | Easy |
| Empirical formula from % composition | High | 4 | Medium |
| Concentration interconversion (M ↔ m, d given) | High | 4 | Medium–Hard |
| Limiting reagent identification | Medium | 4 | Medium |
| Laws of chemical combination (theory MCQ) | Low–Medium | 4 | Easy |
| Normality / equivalent weight | Low | 4 | Medium |
High-Yield Areas
- Mole conversions — always at least 1 Q/year; practise all six conversion pathways.
- Molarity ↔ Molality interconversion — appears when density is given; formula must be memorised.
- Empirical formula — guaranteed if % composition is given; ratio-simplification steps must be fast.
Classic NEET Traps
- "STP vs room temperature" — Using 22.4 L/mol when condition is 25 °C and 1 atm (correct: 24.5 L/mol, or use ideal gas law).
- Stoichiometric ratio trap — When both reactants are in exact stoichiometric proportion, neither is "limiting" — both are completely consumed (NEET 2019, Q trap).
- % by mass vs mole % — Read the question carefully; these are different.
- n-factor in redox vs acid-base — has n-factor 2 in neutralisation but may have a different n-factor in oxidation reactions.
Years with Heavy Weightage
- NEET 2016, 2018, 2019, 2022 had 2 Q each from this chapter.
- NEET 2017, 2020, 2021, 2023 had 1 Q each.